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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26b42c052e5744fc1aa1ed8f815544e961051db6c5b4a5ff864cacdc41fbf6bd' 
  AND token = 'oPz/vMTJAq7/SJUrsUc9LpvKyXojutUWy9g97EeCOWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}